Most contractors see cost movement at month end.
By then, the choices have narrowed. Labour has been used, materials have been ordered, subcontractors have progressed and preliminaries have continued to burn. A report may show the problem clearly, but the project team may no longer have many practical ways to change the result.
Cost control is not about describing yesterday’s position. It is about seeing movement while there is still something you can do.
That means separating the numbers properly, forecasting from the remaining work and acting early rather than late.
This is the commercial discipline of major infrastructure programmes, right-sized for SME, Tier 2 and Tier 3 contractors.
Project controls start with four separate cost layers
A reliable forecast needs four cost layers. Each answers a different question.
| Cost layer | What it tells you | Common evidence |
|---|---|---|
| Budget or cost baseline | What you allowed for the work | Tender estimate, approved budget and cost codes |
| Committed cost | What you have already ordered or signed up to | Purchase orders, subcontracts and agreed instructions |
| Actual cost | What has been invoiced, processed or incurred | Invoices, payroll, plant records and accruals |
| Cost to complete | What the remaining work will cost from today forward | Remaining quantities, productivity, resources and current rates |
The budget is your baseline. It does not remain correct simply because it was approved.
A subcontract, purchase order or agreed instruction creates a commercial commitment before the money leaves the bank. That cost may not appear in your accounting records for several weeks.
Actual cost shows what has reached the ledger. It is important, but it is a lagging measure.
Cost to complete looks forward. It should reflect the work still to be done, the resources required and the productivity you are actually achieving.
The basic forecast relationship is:
Forecast outturn = actual cost + committed cost + cost to complete
To avoid double counting, your team must define the terms consistently. In this calculation, committed cost means committed cost still to be incurred, while cost to complete means further forecast cost that has not yet been committed. Your cost and accounting systems should reconcile these layers clearly.
Why committed cost catches SME contractors out
Many businesses track actual spend carefully but treat commitments as an administrative detail.
That creates a false sense of control.
You can be under budget on actual spend and already be in trouble on commitments. A materials package may have been ordered at a higher rate. A subcontract may have been agreed above the allowance. A design change may have created an obligation that has not yet been invoiced.
If the project budget is major programme-scaleand actual cost is only major programme-scale, that does not mean major programme-scaleremains available. You must first ask what has already been ordered, subcontracted or agreed.
A project controls process should therefore review:
- New purchase orders and subcontract awards
- Approved and pending instructions
- Materials ordered but not delivered
- Subcontractor forecasts against agreed values
- Commitments raised against the wrong cost code
- Commitments that exceed the remaining budget
- Orders that no longer reflect the current scope
The earlier you see the commitment, the earlier you can challenge scope, price, sequencing or procurement.
Build cost to complete from the remaining work
Cost to complete should not be a percentage copied from the original budget.
That is straight-line forecasting. It takes the original allowance, applies a completion percentage and assumes the remaining work will perform in the same way as the work already completed.
Construction rarely behaves so neatly.
A bottom-up forecast starts with the remaining scope. For each work package, review:
- Quantities still to install
- Labour hours and current productivity
- Plant and equipment requirements
- Materials still to purchase
- Subcontractor commitments and expected final accounts
- Remaining preliminaries and programme duration
- Current labour, plant and material rates
- Known changes, risks and constraints
- The effect of any delay or resequencing
If the team has used 1,200 labour hours to complete work allowed at 1,000 hours, the remaining forecast should not quietly assume the original productivity. It should explain why performance changed and whether the cause can be corrected.
A forecast that reflects the remaining work is more useful than a report that merely extends the original estimate.
Variance analysis should explain what moved
A variance report should not stop at “major programme-scaleadverse”.
For each material variance, state:
- What moved?
- By how much?
- Why did it move?
- What does it mean for the final position?
- What action is still available?
You also need to separate the cause.
A genuine change may be recoverable through a variation or NEC4 compensation event. An estimating error is a problem in the original allowance. Productivity loss may require a change in method, supervision, resources or sequencing.
These causes need different responses.
Your NEC4 compensation event process should connect with your forecast. So should delay and programme records. If access, late information or an instruction affects time-related cost, record the event while the facts are available.
The guide to delay analysis and extensions of time explains why the programme, records and cost position must tell the same story.
Watch leading indicators, not just final cost
The final cost is a lagging result. Leading indicators show where it may be heading.
Track the measures that matter to your project, including:
- Labour productivity against the tender allowance
- Plant and equipment utilisation
- Preliminaries burn rate against programme progress
- Subcontract package performance
- Material wastage, damage and returns
- Procurement prices against the estimate
- Programme slippage and its effect on time-related costs
- Rework, defects and incomplete work
- The value of work achieved compared with cost incurred
A project that is 50% through its programme but has used 70% of its preliminaries allowance needs attention now. Waiting for the final account does not improve the position.
Controls should be proportionate. You do not need a process designed for a major infrastructure programme. You do need consistent measures that your site and commercial teams can maintain.
What a CVR brings together
A Cost Value Reconciliation, or CVR, is a practical monthly view of what the job is worth, what it has cost and where the final margin is heading.
It brings together:
- Value certified or assessed
- Cost incurred
- Remaining commitments
- Cost to complete
- Forecast outturn
- Margin achieved to date
- Forecast margin at completion
- Movement since the previous report
- Key risks, changes and actions
The CVR should not be a descriptive report produced after the decisions have been made. It should create the conversation that leads to those decisions.
For most projects, run a formal CVR monthly. Use weekly or fortnightly reviews for live risks, procurement, labour productivity and major packages. The room should include the project manager, site manager, quantity surveyor or commercial lead, planner where relevant and a director or senior decision-maker.
The project controls pillar article explains why controls should connect cost, programme, risk, change and reporting rather than operate as separate spreadsheets.
Month-end discipline keeps the story credible
Your commercial view and accounting view should tell the same story.
That requires proper cut-off and accruals. If work has been completed but the invoice has not arrived, record an accrual. If an invoice relates to a different period, allocate it correctly. If a subcontractor has progressed work but has not submitted a payment application, do not allow the ledger to suggest that no cost exists.
At month end:
- Confirm the reporting cut-off date
- Capture work done but not yet invoiced
- Reconcile invoices, payroll, plant and subcontract records
- Review open purchase orders and commitments
- Check cost coding
- Reconcile the commercial forecast to the accounting records
- Explain material movements from the previous period
A clean ledger with an unrealistic forecast is not control. Neither is a detailed forecast that does not reconcile to the accounts.
Illustrative example: commitments moving ahead of actual spend
The following example is illustrative only.
A contractor starts with a cost budget of major programme-scale.
At the current reporting date:
- Actual cost processed: major programme-scale
- Remaining committed cost: major programme-scale
- Revised cost to complete for uncommitted work: major programme-scale
The forecast outturn is therefore:
major programme-scale + major programme-scale + major programme-scale = major programme-scale
The project appears to have spent only 24% of its budget. However, commitments already cover a further major programme-scale. The revised forecast shows a major programme-scaleadverse movement against the original budget.
That is the point of early control. The project team can still review procurement, productivity, remaining scope and time-related costs before the final position hardens.
Common forecasting failures
| Failure | Why it causes trouble |
|---|---|
| Forecasting by straight-line percentage complete | It hides changes in productivity, rates and remaining scope. |
| Using an optimistic cost to complete | It presents the result you want rather than the position you have. |
| Not reforecasting after a change | The budget and forecast stop describing the same job. |
| Failing to reconcile commitments to the budget | You miss exposure before invoices arrive. |
| Ignoring the cost of delay | Preliminaries, supervision, plant and finance costs continue to run. |
| Reporting only at month end | Decisions arrive after the available choices have reduced. |
| Treating a favourable variance as permanent | Early underspend may reflect timing, not a genuine saving. |
A forecast that only ever moves one way at month end is not a forecast. It is presentation.
Contingency and risk allowance also need basic discipline. Keep known scope, estimated uncertainty and identified risk visible rather than hiding everything in one general allowance. A dedicated post on risk and contingency will cover this in more detail within the cluster.
Further posts will cover schedule control, change and configuration control, earned value without the jargon, and reporting that gets used.
How BHD Limited applies project controls for contractors
BHD Limited is a project controls firm supporting contractors and SMEs across the UK. We bring the commercial discipline used on major infrastructure programmes into a proportionate working process for smaller businesses.
Our work connects forecasting, cost estimating, commitments, programme information, change, risk and commercial reporting. We get onto the numbers early. We tell you the truth about them. We hand you a plan you can act on.
BHD Commercial's team brings 25 years' experience across construction, defence and infrastructure. Our team are members of the relevant professional body.
Our head office is at 66 Paul Street, London EC2A 4NA. We also have a regional office at 4-5 Victoria Square, I11, Wolverhampton, WV1 1LD, reflecting our West Midlands roots while supporting contractors across the UK.
Frequently asked questions
What is cost to complete?
Cost to complete is the forecast cost of finishing the remaining work from the current reporting date. A sound forecast uses remaining quantities, productivity, resources, rates, commitments and known project conditions. It is not simply a percentage of the original budget.
What is the difference between committed and actual cost?
Actual cost has been invoiced, processed or accrued in your records. Committed cost is money you have already agreed to spend through a purchase order, subcontract or instruction, even if the invoice has not arrived.
How often should I forecast?
Run a formal forecast and CVR at least monthly. Review leading indicators weekly or fortnightly on active projects, particularly labour productivity, procurement, subcontract packages, preliminaries and delay-related costs.
Why does my forecast keep moving?
Forecasts should move when the facts move. Scope changes, productivity, procurement prices, programme slippage, accruals and subcontractor information can all change the position. A forecast that never moves is more likely to be stale than accurate.
What is a CVR and do I need one?
A CVR is a Cost Value Reconciliation. It compares value, cost, commitments, forecast outturn and margin movement. If you deliver construction work, a proportionate CVR gives you a clearer grip on performance. It does not need to be oversized, but it does need to be consistent.
See movement early
The practical principle is simple:
Early rather than late. Truth rather than presentation. A usable plan rather than a descriptive report.
Separate the cost layers. Capture commitments when you make them. Forecast the remaining work from the bottom up. Reconcile commercial and accounting records. Act while there are still choices.
If you want a straight view of your current cost position, contact BHD Limited for a free Commercial Health Check. We will review where forecasting, margin or commercial capacity is under pressure and identify a practical next step.